I'm not sure why it would matter all that much (and if you ever had the displeasure of breathing tear gas, I'm guessing neither would you), but I have (sadly) deployed both gas grenades and flashbangs (and I was also on the receiving end of those), and this doesn't sound like any tear gas grenade I've ever seen.
Now I wouldn't claim to know every single ordnance in the world, but considering that -
- we had mostly american technology
- this looks and sound exactly like a flashbang
- I can't think of a reason why a gas grenade would make that type of noise
I'm going to say with a reasonable amount of certainty that it's a flashbang.
Now let me ask you a counter question -
Why do you doubt it's a flashbang?
Like, what reason, outside your weird desire to see these demonstrations fail (that I really can't understand) do you have to even have an opinion about that?